God, am I old..... I've been using "Murphey's Rule" #1, and #2 for years. There were metal scale rulers, haven't seen them in many moons, but unlike CTT's which are marked off in 1/4 scale feet, these are marked off the first 1 1/2 inches in inches, with the 0 in the center, so you can measure on both sides of the 0 mark in inches. 
The #1 one is in 1/72 scale, and 1/48 scale (old aircraft building days) and the #2 one is marked off in 1/35 and 1/32 scale (old 54mm days)
As I said, I haven't seem them advertised in years, so don't know if they are made anylonger. 
Character is what you do when no one is looking. 
Few things are harder to put up with than a good example.- Mark Twain
Make yourself an honest man, and then you may be sure that there is one less scoundrel in the world.--Thomas Carlyle